Final answer #2...
I used a slightly larger than stock receiver which may help with volume. It's the same diameter as the old one but it's about 1.5" longer.
I'm changing out all the hoses but if you just replaced the condenser with a P-flow you would have to deal with the hoses from the compressor to the condenser as well as the line from the receiver/dryer to the evaporator.
I also had to drill a hole for the #6 line leaving the receiver.